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Debt and Financing Obligations (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Total debt and financing obligations consisted of the following:
 December 31,
 20202019
 (Dollars in millions)
7.50 percent senior notes, due 2025 ("2025 Senior Notes")
$587.3 $650.0 
$400.0 revolving credit facility, due 2024 ("Revolving Facility")
88.3 143.3 
5.35 percent financing obligation, due 2024
14.9 7.2 
Total borrowings$690.5 $800.5 
Original issue discount(3.3)(4.3)
Debt issuance costs(10.3)(13.3)
Total debt and financing obligation$676.9 $782.9 
Less: current portion of long-term debt and financing obligation3.0 2.9 
Total long-term debt and financing obligation$673.9 $780.0 
Schedule of Maturities of Long-term Debt
As of December 31, 2020, the combined aggregate amount of maturities for long-term borrowings for each of the next five years is as follows:
(Dollars in millions)
2021$3.0 
20223.2 
20233.3 
202493.7 
2025587.3 
2026-Thereafter— 
Total$690.5